Journal
PROCESS BIOCHEMISTRY
Volume 41, Issue 4, Pages 824-828Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.procbio.2005.10.015
Keywords
nutrient removal; chemical coagulation; wastewater; nitrification; denitrification; moving bed biofilm reactor
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In this study, a combined chemical precipitation and moving bed biofilm system was used to treat municipal wastewater. The moving bed biofilm reactor (MBBR) has been tested for nitrogen removal through simultaneous nitrification and denitrification (SND). The SND could be successfully established at DO of about 2 mg/1, and about 89.9% of total nitrogen (TN) removal efficiency through SND had been achieved in the system. lron(II) sulphate heptabydrate solution was dosed onto the top of MBBR at varying ratios of total phosphorus to iron(H). The performance of the system with respect to BOD, COD, TN removal was not significantly affected by chemical dosing. The phosphorus removal efficiency increased with increasing dose. To meet EC requirements, the most favourable chemical dosing ratio was 1:1.3 (weight ratio P:Fe). The combination of highly efficient nitrogen removal, obtainable in a MBBR and effective phosphorus removal by chemical precipitation with iron(H) should be an ideal option for the total nutrient removal from municipal wastewater. (c) 2005 Elsevier Ltd. All rights reserved.
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